JVR&reg; AO18 Bluetooth Car Kit FM Transmitter Adapter Hands-free Talking Wireless Stereo Music Play LED Display with Dual Port 2.1A/1.0A USB Charger (3.1A Fast Charging with One Port Used) for Smartphones JVR AO18 Bluetooth FM Transmitter is designed for plugged into the cigarette lighter in the car, plays the FM radio speaker by receiving via Bluetooth audio, support Bluetooth hands-free and stereo music, seamlessly switches between incoming calls and music. Dual ports 5V / 4.2A USB car charger can simultaneously charge any 2 tablets or smartphones at full speed Built-in high sensitivity microphone, wireless Bluetooth offers hands-free phone call. With echo cancellation and noise suppression (CVC) technology specifically designed for in-car use, JVR ensures that you get optimal sound during calls. Just turn on your phone Bluetooth function, search "car kit" and connection, then you go while driving Support the critical Bluetooth Advanced Audio Distribution Profile (A2DP) function, so you get CD quality sound. Transmit the music to car audio system via A2DP to enjoy the Hi-Fi music, press CH+ to next song, CH- to previous, gear for the volume adjustment Dual USB output: if one single port used only, the output could be up to 5V / 3.1A for fast charging; 2 ports used simultaneously, each port output is 5V / 2.1A. Get ready to say goodbye to carrying multiple adapters & outlets for any type of USB-powered device. Welcome to 2-in-one power bank car charger convenience era. With 2 ports, you can simply do more and maximize your usage device time Operation guide: 1.Open the car FM Radio speaker; 2.Insert the JVR car charger into the cigarette lighter in the car and keep the FM transmitter and the car FM Radio at the same frequency; 3.Turn the Bluetooth of the AO18 and pair with your phone; 4.Connect with no password (code 0000 if needed)